Feature Request: Values exceeding colour palette min/max default to black instead of the first/last colour in the palette.

[JamesDingle]

When using the default stretching we use for chlor_a (log 10 scaled, 0.01 to ~67) to keep features highlighted nicely but also comparable between images.

However, when a value is below the minimum or above the maximum, in typical viewers/plotting tools they are just shown as either the first or last colour from the palette. In the GIS portal, these default to being shown as black and the option to go White/Transparent/Pick a colour is given in the layer options but is difficult to manage for colour palettes that don't use a colour for which you could easily guess the hex value.

Features requested:

• Use the lowest value colour from the palette for values that are lower than the palette minimum.
• Use the highest value colour from the palette for values that are higher than the palette maximum.
• Potentially make this the default behaviour to keep functionality in line with what is a fairly well established norm across plotting tools/viewers. (at least the ones I'm familiar with)

[JamesDingle]

Apologies @doclements I meant to tag you in this, not assign it to you!

[JamesDingle]

Example of current behaviour

Example of proposed behaviour